Device for controlling gripper shuttles in looms

ABSTRACT

The present invention relates to a device for controlling gripper shuttles looms, particularly those provided with rotary shuttle boxes at both sides thereof. By said device, the gripper shuttle can be efficiently braked upon its arrival at the shuttle box and can be prevented from undesirable recoil into the shed. The device brakes the arriving gripper shuttle along a relatively longer path, but returns the shuttle immediately afterwards in a controllable manner at least partially into the shed, and gradually adjusts the shuttle in the immediate proximity of the selvedge, by cooperation of a weft thread tensioning device on the other side of the loom, so that the weft thread and unthreaded from the gripper shuttle does not excessively project over the fabric selvedge. In accordance with the invention, a braking box is arranged parallel to the guideway of the gripper shuttle in each shuttle box, said braking box being movable in both the radial and longitudinal directions relative to the said guideway of the gripper shuttle, and comprising a braking jaw mounted in an elastic medium and a swingable pawl with a free end located beside the end of said braking box, and a picker with an elastic member mounted beside said braking box and further in the direction of arrival of the gripper shuttle. Said picker is movable in both the radial and longitudinal directions relative to the guideway of the gripper shuttle in the shuttle box, and a stop motion feeler mounted within the range of action of the said free end of the swingable pawl.

Rambousek Apr. 8, 1975 DEVICE FOR CONTROLLING GRIPPER SI-IUTTLES INLOOMS [75] Inventor: Zdenek Rambousek, Liberec,

Czechoslovakia [73] Assignee: Elitex, Zavody textilniho strojirenstvigeneralni reditestvi, Liberec, Czechoslovakia [22] Filed: Apr. 10, 1974[21] Appl. N0.: 460,421

[30] Foreign Application Priority Data Apr. 18. 1973 Czechoslovakia2775-73 [52] U.S. Cl. 139/125; 139/155; 139/185;

139/342 [51] Int. Cl.. D03d 47/24; D03d 49/54; D03d 51/40 [58] Field ofSearch 139/122 R, 125, 126, 155, 139/183, 185, 186, 341, 342, 343

[56] References Cited UNlTED STATES PATENTS 3,332,452 7/1967 Mzyk et al.139/341 3,487,860 l/l970 Suaty et al. 139/125 3,563,281 2/1971Pfarrwaller 139/342 Primary Examiner-Henry S. Jaudon [57] ABSTRACT Thepresent invention relates to a device for controlling gripper shuttleslooms, particularly those provided with rotary shuttle boxes at bothsides thereof. By said device, the gripper shuttle can be efficientlybraked upon its arrival at the shuttle box and can be prevented fromundesirable recoil into the shed. The device brakes the arriving grippershuttle along a relatively longer path, but returns the shuttleimmediately afterwards in a controllable manner at least partially intothe shed, and gradually adjusts the shuttle in the immediate proximityof the selvedge, by cooperation of a weft thread tensioning device onthe other side of the loom, so that the weft thread and unthreaded fromthe gripper shuttle does not excessively project over the fabricselvedge. In accordance with the invention, a braking box is arrangedparallel to the guideway of the gripper shuttle in each shuttle box,said braking box being movable in both the radial and longitudinaldirections relative to the said guideway of the gripper shuttle, andcomprising a braking jaw mounted in an elastic medium and a swingablepawl with a free end located beside the end of said braking box, and apicker with an elastic member mounted beside said braking box andfurther in the direction of arrival of the gripper shuttle. Said pickeris movable in both the radial and longitudinal directions relative tothe guideway of the gripper shuttle in the shuttle box, and a stopmotion feeler mounted within the range of action of the said free end ofthe swingable pawl.

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DEVICE FOR CONTROLLING GRIPPER SHUTTLES IN LOOMS This application isrelated to the coassigned application of Bilek. Ser. No. 461,412, filedApr. l6. 1974 which is based upon Czechoslovakian Patent Application No.PV 2774-73. filed Apr. 18. I973.

The present invention relates to a device for controlling grippershuttles in looms. particularly those pro vided with rotary shuttleboxes at both sides thereof. By

.said device, the gripper shuttle can be efficiently braked upon itsarrival at the shuttle box and can be prevented from undesirable recoilinto the shed. Further, said device can check the correctness of theposition of the gripper shuttle and transfer it temporarily, before itsadjustment to a position suitable for inserting a new weft thread.partially back into the shed. where said gripper shuttle remains untilthe moment at which the warp threads begin to interlace the insertedweft thread.

In looms with gripper shuttles. using a cut weft thread. particularlywith one gripper shuttle turning at its reversing points through 180, acertain loss of weft thread occurs due to the excessively long weftthread ends projecting over the selvedge.

Heretofore. it was necessary for unthreading the end of the insertedweft thread from the gripper shuttle to make the gripper shuttlecompletely leave the shed.

The inserted weft thread was tensioned from the other side of the loom,this being inaccurate and the projecting weft thread ends being quitelong. The said projecting ends were inserted either into the next shedor cut off.

In order to obtain projecting weft thread ends as short as possible. ithas been attempted to brake the arriving gripper shuttle along theshortest possible path. However. on a short braking path. the braking ofthe gripper shuttle is too hard and causes an excessive wear of both thebraking jaws and the damper inside the shuttle box.

It is more advantageous to have a device which brakes the arrivinggripper shuttle along relatively longer path, but which returns theshuttle immediately afterwards in a controllable manner at leastpartially into the'shed, and which gradually adjusts the shuttle in theimmediate proximity of the selvedge, by cooperation of a weft threadtensioning device on the other side of the loom, so that the weft threadend unthreaded from the gripper shuttle does not excessively projectover the fabric selvedge. This problem is solved by the device accordingto the present invention.

In accordance with the invention a braking box is arranged parallel tothe guideway of the gripper shuttle in each shuttle box, said brakingbox being movable in both the radial and longitudinal directionsrelative to the said guideway of the gripper shuttle, and comprising abraking jaw mounted in an elastic medium and a swingable pawl with afree end located beside the end of said braking box. and a picker withan elastic member mounted beside said braking box and further in thedirection of arrival of the gripper shuttle. Said picker is movable inboth the radial and longitudinal directions relative to the guideway ofthe gripper shuttle in the shuttle box, and a stop motion feeler mountedwithin the range of action of the said free end of the swingable pawl. I

Further advantages and features of the present invention are describedin the following specification which obviously does not include allpossible embodiments of the present invention, and in the accompanyingdrawings. in which:

FIG. 1 is a diagrammatic view in elevation of the driving mechanism andthe slay of the loom, illustrative embodiment of the device according tothe present invention being shown mounted on the loom;

FIG. 2 is a view on an enlarged scale partially in elevation andpartially in section of the device at the right side of the loom, theview showing the arrangement of the braking box and the picker at theends of two arm levers mounted swingably on a transversal carrier andcontrolled by cams on the control drum;

FIG. 3 is a view in longitudinal section through the braking box and thepicker in their basic position when observed from above before thearrival of the gripper shuttle, the stop motion feeler and its electriccircuit being shown diagrammatically;

FIG. 4 is a view similar to FIG. 3, but showing a partial penetration ofthe gripper shuttle into the shuttle box and its braking by the brakingjaw in the braking box;

FIG. 5 is a view similar to FIG. 3, but showing the gripper shuttlecompletely stopped after its arrival and braking by the braking jaw bythe impact of its front side against the buffer of the picker;

FIG. 6 is a view similar to FIG. 3, but with the gripper shuttle beingshown after being pressed by the picker into the shed and with the wholegripper box; the correct position of the braking box pawl beingcontrolled by the stop motion feeler;

FIG. 7 is a view of the device as shown inf FIG. 3, upon the returningof the gripper shuttle by the action of the pawl in the braking boxsimultaneously with movement of said braking box and picker into aposition suitable for feeding a new weft thread into the grippingmechanism of the gripper shuttle;

FIG. 8 is a view similar to FIG. 3 of the device at the moment at whichthe gripper shuttle did not arrive at the shuttle box at an appropriatespeed. the swingable pawl thus having not engaged the edge of thegripper shuttle, the stop motion feeler being swung out upon the movingback of said gripper shuttle, as shown in dot-and-dash lines (or as inFIG. 6), and thereby interrupting the electric circuit of the loom;

FIG. 9 is a view in cross-section through the braking box, the grippershuttle and the shuttle box, the section being taken along line A--A inFIG. 3; and

FIG. 10 is a view in longitudinal section through the picker and thebraking box, the section being taken along line 8-8 in FIG. 3.

The following specification of the device for controlling the grippershuttle is directed to the device shown on the right side of a loom withrotary shuttle boxes at both sides thereof shown in FIG. 1; the devicesemployed on both sides of the loom are identical.

On the frame 1 ofthe loom (FIG. I) there is mounted the transverse mainshaft 2 on which there is rotatably mounted a tube 3. A slay 5 isfastened on slay arms 4 and carries a reed 6 and a guiding comb 7. Reed6 and guiding comb 7 define a path for the transfer of a gripper shuttle14 from one side of the loom to the other. The gripper shuttle 14 has afront part 19, a rear surface 20 and an edge (FIG. 4). In a bracket 8affixed to the frame of the loom there are mounted mechanisms forcontrolling gripper shuttle 14, i.e., a braking box 9, a picker 10, acontrol mechanism 11, a rotary shuttle box 12, and a pneumatic ejectingmechanism 13.

The loom is driven by a motor 15, which drives via transmission 16 anelectromagnetic clutch-brake mechanism 17 mounted on shaft 2 andframe 1. When current flows through terminals 18, which are connected tothe control and detecting circuits. the mechanism 17 operates as aclutch. When the current flow is interrupted in either the control ordetecting circuit. the mechanism 17 operates as a brake which stops theloom.

The braking box 9 (FIG. 2) and picker 10 are movable along the shuttlebox 12, and are further movable in a direction perpendicular to theshuttle box 12 so as to be able to move away or deviate from the grippershuttle 14 at the time of its ejection.

For that purpose, the braking box 9 and the picker 10 are fastened atthe ends of respective two arm levers 21 and 22 swingable in the planeof the paper of FIG. 2 about pins 24, 25 on a transverse carrier 23which is mounted by means of pins 31 in bearings in bracket 8. The lowerends (FIG. 2) of two arm levers 21, 22 are provided with pins 26, 27 andcam following rollers which are guided by box cams 29, 30 in the controldrum 28 which controls thereby the motions of the braking box 9 ofshuttle box 12 and the picker 10.

The deviation of the braking box 9 with the picker 10 upon ejection ofthe gripper shuttle 14 from the shuttle box 12 is controlled by a radialor face cam 32 which controls via a cam follower roller 34 on a lever 33the transverse carrier 23 for the two arm levers 21, 22. The positivecontact of radial cam 32 and roller at all times is achieved by means ofa coil tension spring 35.

The braking box 9 (FIG. 3) is formed by a hollow body or housing 44which carries on a pin 45 a swingable pawl 46, the braking box furthercomprising springs 47 at the left and a spring 48 at the right, whichpress the wedge-shaped braking jaw 49 upwardly until its outwardlyflanged side edges 50 engage the inwardly flanged side edges 51 (FIG. 9)of hollow body 44. A further spring 52 holds the swingable pawl 46 insuch manner, that between edge 70 of gripper shuttle l4 and the finger53 of the swingable pawl 44 there is formed a clearance T The swingablepawl 46 is provided with a surface 69 (FIG. 4). The swinging motion ofthis pawl 46 is limited by stop 66 inside hollow body 44, which isprovided with a projection 67. The shape of finger 58 of the swingablepawl 46 is shown in FIG. 10.

Picker 10 is formed by a picker body 56 which carries a buffer 54 on apin 55, the buffer being supported by a rubber block 57 (FIG. 10).Opposite to the holder of picker 10 there is mounted a trigger rod 36which passes through guideway 37 in bracket 8. Spring 38 holds rod 36inside the pit of the lower arm ofa first class lever 39 (FIG. 2) ofwhich the other arm releases the lock 40 of the pneumatic mechanism 13for ejecting gripper shuttle 14.

In FIG. 3 the control mechanism 11 is, for the purpose of clarity shownturned through 90 relative to FIG. 2 into the plane of the drawing. Saidmechanism which is fastened to bracket 8, comprises a pivot pin 61 and afeeler in the form of a first-class lever, of which the upper arm ispositioned against the front 58 of swingable pawl 46 and the lower armengages switch 62. The said lower arm of feeler 60 cooperates with aShuttle box 12 is rotatable about an axis which is perpendicular to theplane of the paper in FIG. 2, the shuttle box being rotated upon feedinga new weft thread into gripper shuttle 14. Because gripper shuttle 14 isonesided, it must be turned for each insertion with its front part inthe direction towards the shed. The shuttle box 12 has a dove tailshaped groove (FIG. 9) into which the bottom 42 and side guideways 43 ofthe gripper shuttle 14 fit. The gap between the reed 6 and the shuttlebox 12 is covered by a plate 41, the active surface of which is situatedin the same plane as the bottom 42 of shuttle 12, and the active surfaceof the reed 6. The plate 41 does not prevent rotation of gripper shuttle14 with shuttle box 12.

The electric circuit 71 and switch 62 of electromagnetic clutch-brake 17is completed by power source 72 and terminals 73, to which there areconnected the circuit of warp and weft stop motions (not shown) and thestop (also not shown) press button. The two switches 62 (of both theleft and right control mechanism 11) are connected in series with othercircuit elements.

The not shown stop press button has a parallel arch controlled by a cam(not shown), and thus the loom can be stopped only when slay 5 is in itsrear dead center position.

In FIG. 4 the weft thread to be inserted is denoted by referencecharacter 74; in FIG. 7, the warp of the selvedge of the fabric beingformed is denoted by reference character 75.

It is to be understood that the preceding specification and the drawingsand mechanisms mainly describe those mechanisms which form part of thepresent invention, however, the also described mechanical assemblies inwhich the said mechanisms are located for obtaining a completeunderstanding of the operation, but which themselves are not the subjectmatter of the present invention.

The device of the invention operates as follows.

The gripper shuttle 14, upon arrival at the right side of the loom (FIG.3) passes under the finger 53 of the swingable pawl 46, which is locateda distance Y from the edge of gripper shuttle 14 and enters a wedgelikenarrowing gap formed between the plate 41, the bottom 42 of shuttle box12, and the friction surface 68 of braking jaw 49. The wedge-likebraking jaw 49 is made of elastic, light material, and thus upon theenter-- ing of gripper shuttle 14 into said gap of the braking jaw 49does not recoil; as a consequence, the friction surface 68 thus firmlycontacts the whole surface of edge 70 of gripper shuttle 14.

The gripper shuttle 14 is intensively braked by the friction between thebottom 42 of shuttle box 12 and the bottom surface of the shuttle and bythe friction between the friction surface 68 of braking jaw 49 and thesurface of the edge 70 of the shuttle, i.e. on its two parallelyarranged surfaces. The side guideways 43 only guides the gripper shuttle14 for the purpose of keeping it from deviating from its direction.

The penetrating gripper shuttle 14 moves the wedge shaped braking jaw 49inthe direction opposite to the action of springs 47 and 48. The spring48 begins to act at its other end upon arm 59 of swingable pawl 46,overcomes the force of spring 52, and turns the swingable pawl 46through a distance Y until the finger 53 of said pawl bears against edge70 of gripper shuttle 14 (FIG. 4). The gripper shuttle l4 continues itsmotion to the right (FIG. 3) and the wedge shaped braking jaw 49 is thusmoved further by its action against the resistance of spring 48, thebias of which further increases. When the edge 70 of gripper shuttle 14,which is actually formed by edge 70 and surface 20, passes below finger53 of swingable pawl 46 and over its edge formed by finger 53 andsurface 69 of said pawl 46, the bias of spring 48, causes by the liftingof the wedge shaped braking jaw 49, finishes the turning of swingablepawl 46 as far as stop 66 through a distance Y (FIG. 5). The stop 66 isnecessary in order that the finger S3 of swingable pawl 46 shall not belocated in the path of the rear part of gripper shuttle 14, in which theweft thread 74 to be inserted is gripped. The progessively more intensebraking of the gripper shuttle 14 is carried on until its completestoppage. which can take place even before front 19 of gripper shuttle14 comes into contact with buffer 54 of picker 10. If the front 19 ofgripper shuttle 14 should engage the buffer 54, the damping of suchimpact is transferred by turning the buffer 54 about pivot 55 to therubber block 57 which acts as a damping spring.

The first purpose of turning the swingable pawl 46 is so that in case ofincorrect operation of the wedge shaped braking jaw 49 upon its becomingworn. because of excessive lubrication. or due to a broken spring 47,said gripper shuttle 14 cannot recoil from picker back into the shed.The self-acting operation of pawl 46, which is forced by gripper shuttle14 via a wedge shaped braking jaw 49 and spring 48, is necessary becausethe direct lifting of swingable pawl 46 which is controlled by grippershuttle 14, has still a further advantage. particularly upon controllingthe arrival of gripper shuttle 14 into shuttle box 12, which is nowdescribed.

At the time at which the presence of gripper shuttle 14 in the shuttlebox 12 is presumed. it is necessary to return its end (shown at the leftin FIG. 4), in which the weft thread 74 to be inserted is gripped.partially into the shed upon the simultaneous retensioning of weftthread 74 by a tensioning device (not shown at the other side of theloom. By a small moving away of braking box 9 and picker 10 from shuttlebox 12, the gripper shuttle 14 is unbrakcd, but only to such an extentIt should be noted that the arrival of gripper shuttle 14 is controlledby turning the finger 53 of the swingable pawl 46 from its basicposition between the arrival of gripper shuttle 14 at first for adistance Y (FIGS. 3, 4) and then for another distance Y (FIG. 5). Thetotal distance of turning Y Y is greater than the distance X (FIG. 3) ofthe overlap of the front 58 of swingable pawl 46 and the feeler 60 ofcontrol mechanism 11, for a distance X (FIG. 5). The relation is asfollows: I Y X X Then, upon displacement of braking box 9 in thedirection of arrow C and upon the correct positioning of gripper shuttle14, the front of swingable pawl 46 passes beside the arm of feeler 60 ata distance X and the operation of the loom is carried on. The secondpurpose of the swingable pawl 46 is thus that by its position itcontrols the presence of gripper shuttle l4 and limits, moreover, themovement of the gripper shuttle upon its being returned into the shed bypicker 10.

At a given moment. it is necessary to draw the end of gripper shuttle14, after releasing the inserted weft thread 74 therefrom, out of theshed and to displace it to the right (FIG. 6), as shown by arrow Ethrough a distance equal to the length of arrow E. This is performed bythe common movement of brake box 9 and picker l0. Gripper shuttle 14 isdrawn by engagement of surface 69 of pawl 46 with surface 20 of theshuttle. The end position (FIG. '7) is a position in which duringbeat-up of slay 5 there is inserted a new weft-thread into grippershuttle 14 for the next insertion of gripper shuttle 14 into the shed inthe opposite direction.

After inserting a new weft thread into gripper shuttle l4 and itsturning for together with gripper box 12 while the braking box 9 andpicker 10 are simul taneoulsy moved away from each other, the grippershuttle 14 is ejected into the shed. The impulse to the ejection isgiven by movement of picker 10 in its operative stroke in the directionof arrow F (FIG. 7). and is transmitted to the lock 40 of the pneumaticejecting device 13 by rod 36 and rocker lever 39 (FIG. 2). No furthermechanism is necessary for causing said inpulse of the picker.

During operation, the following failures might take place:

I. A complete short pick of gripper shuttle 14, outside shuttle box 12.

2. An insufficient penetration of gripper shuttle 14 into grippershuttle box 12.

switch 62, the braking box 9 and picker 10 are removed from the activerange of feeler 60 and it would still be possible to start the loombefore removing the failure, whereupon the loom would be destroyed. Theblocked control mechanism 11 reminds the attendant that the failure mustfirst be removed, and them, by pressing hand lever 63, the controlmechanism 11 is to be released. Only afterwards can the loom be started.

A failure as mentioned under 3) might take place, e.g., by an increasedresistance of the weft 74 to be inserted. That means that the grippershuttle 14 has a delay upon running through the shed, and at the momentof displacement of braking box 9 in the direction of arrow C is only inthe position as shown in FIG. 4. Because of this, the control mechanismstops the loom but the gripper shuttle 14 still reaches its correctposition. The attendant of the loom need only then release the controlmechanism 11 and start the loom.

It follows from the above description of the control mechanism 11, thatsaid mechanism is at rest during normal operation of the loom andfurther, that it does not require a special drive, because the mechanismcontrolling the braking box 9, or picker l0, respectively, is used.

The deviation in a radial direction away from the shuttle box 12 of thetwo arm levers 21 and 22 which at their free ends carry the braking box9 and picker 10, is performed by turning their transverse carrier 23.The position of the transverse carrier 23 is controlled by the radialcam 32, on the circumference of which there is at least one radialrecess (not shown). As soon as roller 34 of lever 33 of the transversecarrier 23 is in said recess, the said two arm levers 21 and 22 aredeviated. ln order to be able to perform this deviation of two armlevers 21 and 22 further radial recesses are also formed in the campaths 29 and 30 about a plane passing through said one recess and thecommon axis of rotation of radial cam 32 and control drum 28, saidfurther radial recesses having depths which are sufficient to permitsuch deviation of the levers 21 and 22. It should be noted that thespring loaded lever 63 may if desired be operated manually.

Although the invention is illustrated and described with reference toone preferred embodiment thereof, it is to be expressly understood thatit is in no way limited to the disclosure of such a preferredembodiment, but is capable of numerous modifications within the scope ofthe appended claims.

What is claimed is:

1. A device for controlling a gripper shuttle in looms having rotaryshuttle boxes on both sides thereof, each shuttle box having a guidewayfor the gripper shuttle. said device comprising a braking box disposedparallel with the guideway, the braking box being movable in both radialand longitudinal directions relative to said guideway, said braking boxcomprising a braking jaw mounted in an elastic medium and a swingablepawl with a free end, the braking box being located beside the edge ofsaid shuttle box. and a picker with an elastic member aligned with thebraking box along the direction of pick of the gripper shuttle, meansmounting said picker for movement in both radial and the longitudinaldirection relative to the guideway for the gripper shuttle in theshuttle box, and a feeler of a stop motion mounted within the range ofsaid free end of the swingable pawl.

2. A device as claimed in claim 1, wherein the braking box comprises aplurality of springs, of which at least two springs bear against thebottom of the braking box and supporting the brakingjaw, two furtheraligned springs mounted above each other one of said further springsbearing against the bottom of the braking box and the other of saidfurther springs supporting the braking jaw, and a swingable pawl havinga controlled end disposed between the confronting ends of said twofurther springs.

3. A device as claimed in claim 1, wherein the braking jaw in thebraking box is wedge-shaped and is arranged with its extended end in thedirection of picking of the gripper shuttle into shuttle box.

4. A device as claimed in claim 1, wherein on the surface of the elasticmember of the picker there is arranged a swingable buffer.

5. A device as claimed in claim 1, wherein the braking box areindependently fastened at the free ends of two respective two-armlevers, of which each is arranged swingably in one plane on a transversecarrier which is swingably arranged in another plane, the opposite endsof said two two-arm levers being in engagement with respective cam pathsof a control drum.

6. A device as claimed in claim 5, comprising a radial cam for operatingthe lever of the transverse carrier for said two two-arm levers, saidradial cam being coupled with the control drum for the two two-armlevers.

7. A device as claimed in claim 6, wherein the radial cam for the leverof the transverse carrier for the two two-arm levers is provided at itsactive surface with at least one radial recess, and in the plane passingthrough said recess and the axis of rotation to both the radial cam andthe control drum there are radial recesses in the cam paths of saidcontrol drum, said recesses being directly proportional in the length oftheir radial to those of the active surface of the recess of the radialcam.

8. A device as claimed in claim 1, wherein a spring loaded lever isattached to a feeler of the stop motion with attached opening contactsof an electric control circuit, said lever spring loaded lever beingprovided at the end thereof which cooperates with said feeler, with atleast two gradual steps for the detecting position or the swung outopening position of the feeler.

9. A device as claimed in claim 8, wherein the spring loaded lever ofthe feeler of the stop motion is adapted for manual control.

10. A device as claimed in claim 1, wherein the braking jaw is elastic.

1. A device for controlling a gripper shuttle in looms having rotaryshuttle boxes on both sides thereof, each shuttle box having a guidewayfor the gripper shuttle, said device comprising a braking box disposedparallel with the guideway, the braking box being movable in both radialand longitudinal directions relative to said guideway, said braking boxcomprising a braking jaw mounted in an elastic medium and a swingablepawl with a free end, the braking box being located beside the edge ofsaid shuttle box, and a picker with an elastic member aligned with thebraking box along the direction of pick of the gripper shuttle, meansmounting said picker for movement in both radial and the longitudinaldirection relative to the guideway for the gripper shuttle in theshuttle box, and a feeler of a stop motion mounted within the range ofsaid free end of the swingable pawl.
 2. A device as claimed in claim 1,wherein the braking box comprises a plurality of springs, of which atleast two springs bear against the bottom of the braking box andsupporting the braking jaw, two further aligned springs mounted aboveeach other one of said further springs bearing against the bottom of thebraking box and the other of said further springs supporting the brakingjaw, and a swingable pawl having a controlled end disposed between theconfronting ends of said two further springs.
 3. A device as claimed inclaim 1, wherein the braking jaw in the braking box is wedge-shaped andis arranged with its extended end in the direction of picking of thegripper shuttle into shuttle box.
 4. A device as claimed in claim 1,wherein on the surface of the elastic member of the picker there isarranged a swingable buffer.
 5. A device as claimed in claim 1, whereinthe braking box are independently fastened at the free ends of tworespective two-arm levers, of which each is arranged swingably in oneplane on a transverse carrier which is swingably arranged in anotherplane, the opposite ends of said two two-arm levers being in engagementwith respective cam paths of a control drum.
 6. A device as claimed inclaim 5, comprising a radial cam for operating the lever of thetransverse carrier for said two two-arm levers, said radial cam beingcoupled with the control drum for the two two-arm levers.
 7. A device asclaimed in claim 6, wherein the radial cam for the lever of thetransverse carrier for the two two-arm levers is provided at its activesurface with at least one radial recess, and in the plane passingthrough said recess and the axis of rotation to both the radial cam andthe control drum there are radial recesses in the cam paths of saidcontrol drum, said recesses being directly proportional in the length oftheir radial to those of the active surface of the recess of the radialcam.
 8. A device as claimed in claim 1, wherein a spring loaded lever isattached to a feeler of the stop motion with attached opening contactsof an electric control circuit, said lever spring loaded lever beingprovided at the end thereof which cooperates with said feeler, with atleast two gradual steps for the detecting position or the swung outopening position of the feeler.
 9. A device as claimed in claim 8,wherein the spring loaded lever of the feeler of the stop motion isadapted for manual control.
 10. A device as claimed in claim 1, whereinthe braking jaw is elastic.